Having recently bought a SDM3055, here's some things I'd like to note.
The meter I received does not have a back faceplate with the "extension card option". Not that it matters to me, but the pictures I've seen everywhere doesn't match.
Measuring ambient temperature around 20ºC is 1.5...3ºC above. Tends to converge over time, but still 1...1.5ºC off
The last 2 digits could be omitted since they are always jumping all over, and are useless.
And... why is 'ºC' and 'ºF' lettering, different from the rest of display, like 'K'
The EasyDMM display has an error above the button 'Cont', because it should show 'diode' not 'freq'
I would prefer the second reading in dual mode to show up like the "Measure value" in temperature mode. Bigger numbers. The 'range' display could be placed above that or at the top next to 'Auto trig'. The way it looks now, it's like a sticker to patch a mistake
In the dual mode, I'm unable to place frequency or period as a second reading of each other. I'm probably being clumsy but in dual mode I always manage to double display frequency or period.
Unlike what's stated in the datasheet, my SDM3055 is a not a 240,000count.
Regularly is a 220,000 count
, but it acts weird in
dual mode, behaving like a 999,999count
In 'single mode' display, it always jumps to the next range when reaching 220,000 count if in auto-range, or overflows if in manual-range.
Use cases in Dual mode ----------------------------------------------------------------------------------------------------------------------------------------------
Up to 999.999mVAC - 999,999 count
Up to 9.99999VAC - 999,999 count
But the really weird behaviour is when in dual mode mVDC+mVAC it jumps from 200mV scale to 1000V though it still displays it's in 200mV range, but showing 000.220v, ignoring the 2v range were it should be if 200mV was overflown.
Below 220mVDC - 220,000 count
When 220mVDC is overflown -
Don't know if all this was known, since I have to admit that I didn't read all the thread, but as I have the latest firmware version 1.01.01.25, seems that are some bugs left to correct.
Conclusion: It's
almost perfect.